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ISP Optics Germanium (Ge) Windows

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  • Minimal Chromatic Aberration Due to Low Dispersion
  • Uncoated Transmission from 2 – 16µm
  • Available with BBAR or DLC Coating for 8 – 12µm
  • Due to material supply chain disruptions with germanium, there may be increased lead times and price changes on our germanium products. For more information, please contact our customer service team.
  • Edmund Optics has limited remaining inventory of this part number and no raw material available to supply more once this is depleted.  Please contact our Product Support Engineers to help with an alternate solution for your needs. Customer Service can provide you the latest price and availability.

ISP Optics Germanium (Ge) Windows provide transmission and low absorption through the Long-Wave Infrared (LWIR) spectrum, making it useful for thermal imaging applications. Germanium features a Knoop Hardness of 780, making it ideal for infrared applications requiring rugged optics. These windows are available uncoated, Broadband Anti-Reflection (BBAR) coated for 8 – 12µm, or Diamond-Like Carbon (DLC) coated for 8 – 12µm. ISP Optics Germanium Windows are ideal for integration into thermal imaging systems, especially those that require rugged optics. Germanium is subject to thermal runaway, meaning that the transmission decreases as temperature increases. As such, these germanium windows should be used at temperatures below 100°C.

Common Specifications

Bevel:
Protective as needed
Clear Aperture (%):
85
Thickness (mm):
3.00 ±0.13
Edges:
Fine Ground
Knoop Hardness (kg/mm2):
780.00
Parallelism (arcmin):
<3
Poisson's Ratio:
0.28
Young's Modulus (GPa):
102.7
Index of Refraction (nd):
4.002 @ 11µm
Substrate:
Germanium (Ge)
Surface Flatness (P-V):
λ/10 @ 10.6μm
Surface Quality:
40-20
Wavelength Range (nm):
2000 - 14000
Coefficient of Thermal Expansion CTE (10-6/°C):
6.1
Density (g/cm3):
5.33

Products

Dia. (mm)  Thickness (mm)   Coating   Model Number   Compare   Stock Number   Price  Buy
25.40 3.00 BBAR (8000-12000nm) AR812-GE-W-25-3 #24-572 €408,00   Request Quote  
  • 3-4 days
    ×
 
38.10 3.00 S1: DLC Coating
S2: BBAR (8000-12000nm) 		DLC812-GE-W-38-3 #24-578 €787,00   Request Quote  
  • 3-4 days
    ×
 

Special Handling

Germanium Optics Handling and Cleaning Guidelines

Germanium optics require special handling and cleaning procedures. Always wear gloves during handling to prevent contamination, and wash hands afterward. Avoid contact between Germanium dust and the eyes, skin, or clothing. When not in use, store optics sealed and covered at temperatures between 20°C and 25°C. Do not expose them to temperatures exceeding 100°C when in use.

Handling Guidelines

  • Always wear gloves to prevent damage from skin oils.
  • If Germanium dust is present, take the following precautions:
    • Wear safety glasses to protect eyes.
    • Use a dust mask or face mask to avoid inhalation.
    • Wear gloves to prevent skin contact.
  • Maintain storage temperature between 20°C and 25°C with humidity below 30%.
  • Wrap Germanium optics in a lens cloth or pouch and seal in a container when not in use.
  • Germanium is brittle and heavy — always place it on soft surfaces and avoid dropping it.

Approved Cleaning Solvents

  • Ethanol
  • Isopropyl Alcohol
  • Methanol
  • Reagent-Grade Acetone
  • Liquid CO₂
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